One of few remaining such lanes, the Suez Canal tapers as it goes downhill until it's less than a metre wide (hence the name, which is also a pun on the word 'sewers'). Constructed in the 1840s, it was notorious as a lurking point for members of the Rocks Push, a street gang that relieved many a drunk of their wallet in the latter part of the 19th century.
Where it intersects Nurses Walk there's a hoist once used for hauling goods to the upper floors.